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You are running quite hot, but you aren't going to start to boil your CPU until you get past 75C--I'd get a better fan because your fan obviously isn't able to handle the load. You should be getting temperatures below 45C. Try getting one of those P125 Alphas.

I have a PIII 500 running at 585 with an Alpha P125C. I can run Prime95 for hours and the CPU temp never gets above 32 degrees C. Make sure you get the plastic cover off though, it keeps a lot of heat in.